delay.cpp File Reference

#include <memory>
#include <string_view>
#include "debug.h"
#include "module.h"
#include "audio/audio_filter.h"
#include "audio/types.h"
#include "lib_common.h"
#include "utils/ring_buffer.h"
#include "utils/misc.h"
#include "utils/string_view_utils.hpp"

Include dependency graph for delay.cpp:

Go to the source code of this file.

Classes
struct	state_delay

Functions
static af_result_code	configure (void *state, int in_bps, int in_ch_count, int in_sample_rate)
static void	done (void *state)
static af_result_code	filter (void *state, struct audio_frame **frame)
static void	get_configured (void *state, int *bps, int *ch_count, int *sample_rate)
static af_result_code	init (struct module *parent, const char *cfg, void **state)
static af_result_code	parse_cfg (state_delay *s, std::string_view cfg)
	REGISTER_MODULE (delay, &audio_filter_delay, LIBRARY_CLASS_AUDIO_FILTER, AUDIO_FILTER_ABI_VERSION)
static void	set_delay_size (state_delay *s, int size)
static void	usage ()

Variables
static const struct audio_filter_info	audio_filter_delay

Detailed Description

Author

Martin Piatka piatk.nosp@m.a@ce.nosp@m.snet..nosp@m.cz

Definition in file delay.cpp.

Function Documentation

configure()

static af_result_code configure ( void * state, int in_bps, int in_ch_count, int in_sample_rate )

static

Definition at line 125 of file delay.cpp.

{
        auto s = static_cast<state_delay *>(state);
 
        s->bps = in_bps;
        s->ch_count = in_ch_count;
        s->sample_rate = in_sample_rate;
 
        if(!s->frame_mode){
                int samples = (s->sample_rate / 1000) * s->req_delay;
                set_delay_size(s, samples * s->ch_count * s->bps);
        }
 
        return AF_OK;
}

References AF_OK, state_delay::bps, set_delay_size(), and state.

Referenced by filter().

Here is the call graph for this function:

done()

static void done ( void * state )

static

Definition at line 142 of file delay.cpp.

                             {
        auto s = static_cast<state_delay *>(state);
 
        delete s;
}

References state.

filter()

static af_result_code filter ( void * state, struct audio_frame ** frame )

static

Definition at line 158 of file delay.cpp.

                                                                     {
        auto s = static_cast<state_delay *>(state);
 
        struct message *msg;
        while ((msg = check_message(s->mod.get()))) {
                const char *text = ((msg_universal *) msg)->text;
                if(parse_cfg(s, text) != AF_OK){
                        free_message(msg, new_response(RESPONSE_BAD_REQUEST, nullptr));
                        continue;
                }
 
                if(!s->frame_mode){
                        int samples = (s->sample_rate / 1000) * s->req_delay;
                        set_delay_size(s, samples * s->ch_count * s->bps);
                }
 
                free_message(msg, new_response(RESPONSE_OK, nullptr));
        }
 
        auto f = *frame;
        if(s->frame_mode){
                set_delay_size(s, f->data_len * s->req_delay);
        }
 
        if(f->bps != s->bps || f->ch_count != s->ch_count){
                if(configure(state, f->bps, f->ch_count, f->sample_rate) != AF_OK){
                        return AF_MISCONFIGURED;
                }
        }
 
        //If ring is null, delay is 0
        if(!s->ring)
                return AF_OK;
 
        if(f->data_len <= s->delay_size){
                ring_buffer_write(s->ring.get(), f->data, f->data_len);
                ring_buffer_read(s->ring.get(), f->data, f->data_len);
        } else {
                int excess_size = f->data_len - s->delay_size;
 
                //Write the last delay_size bytes to buffer
                ring_buffer_write(s->ring.get(), f->data + excess_size, s->delay_size);
 
                //Move the beggining of frame to the end and prepend delay_size bytes from buffer
                memmove(f->data + s->delay_size, f->data, excess_size);
                ring_buffer_read(s->ring.get(), f->data, s->delay_size);
        }
 
        return AF_OK;
}

References AF_MISCONFIGURED, AF_OK, check_message(), configure(), frame, free_message(), msg, new_response(), parse_cfg(), RESPONSE_BAD_REQUEST, RESPONSE_OK, ring_buffer_read(), ring_buffer_write(), set_delay_size(), and state.

Here is the call graph for this function:

get_configured()

static void get_configured ( void * state, int * bps, int * ch_count, int * sample_rate )

static

Definition at line 148 of file delay.cpp.

{
        auto s = static_cast<state_delay *>(state);
 
        if(bps) *bps = s->bps;
        if(ch_count) *ch_count = s->ch_count;
        if(sample_rate) *sample_rate = s->sample_rate;
}

References state_delay::bps, sample_rate, and state.

init()

static af_result_code init ( struct module * parent, const char * cfg, void ** state )

static

Definition at line 102 of file delay.cpp.

                                                                                {
        auto s = std::make_unique<state_delay>(parent);
 
        auto ret = parse_cfg(s.get(), cfg);
        if(ret == AF_OK)
                *state = s.release();
 
        return ret;
};

References AF_OK, parent, parse_cfg(), and state.

Here is the call graph for this function:

parse_cfg()

static af_result_code parse_cfg ( state_delay * s, std::string_view cfg )

static

Definition at line 84 of file delay.cpp.

                                                                   {
        auto tok = tokenize(cfg, ':');
        if(tok.empty() || tok == "help"){
                usage();
                return AF_HELP_SHOWN;
        } 
 
        if(!parse_num(tok, s->req_delay)){
                log_msg(LOG_LEVEL_ERROR, "Failed to parse delay time\n");
                usage();
                return AF_FAILURE;
        }
 
        s->frame_mode = (tokenize(cfg, ':') == "frames");
 
        return AF_OK;
}

References AF_FAILURE, AF_HELP_SHOWN, AF_OK, state_delay::frame_mode, LOG_LEVEL_ERROR, log_msg(), parse_num(), state_delay::req_delay, tokenize(), and usage().

Referenced by filter(), and init().

Here is the call graph for this function:

REGISTER_MODULE()

REGISTER_MODULE	(	delay	,
		&	audio_filter_delay,
		LIBRARY_CLASS_AUDIO_FILTER	,
		AUDIO_FILTER_ABI_VERSION	)

set_delay_size()

static void set_delay_size ( state_delay * s, int size )

static

Definition at line 112 of file delay.cpp.

                                                    {
        if(size == s->delay_size)
                return;
 
        if(size == 0){
                s->ring.reset();
        } else {
                s->ring.reset(ring_buffer_init(size * 2));
                ring_fill(s->ring.get(), 0, size);
        }
        s->delay_size = size;
}

References state_delay::delay_size, state_delay::ring, ring_buffer_init(), and ring_fill().

Referenced by configure(), and filter().

Here is the call graph for this function:

usage()

static void usage ( void )

static

Definition at line 78 of file delay.cpp.

                   {
        printf("Delays audio:\n\n");
        printf("delay usage:\n");
        printf("\tdelay:<delay in milliseconds>\n\n");
}

Referenced by parse_cfg().

Variable Documentation

audio_filter_delay

const struct audio_filter_info audio_filter_delay

static

Initial value:

= {
        .name = "delay",
        .init = init,
        .done = done,
        .configure = configure,
        .get_configured_in = get_configured,
        .get_configured_out = get_configured,
        .filter = filter,
}

Definition at line 209 of file delay.cpp.

                                                           {
        .name = "delay",
        .init = init,
        .done = done,
        .configure = configure,
        .get_configured_in = get_configured,
        .get_configured_out = get_configured,
        .filter = filter,
};